Wake window calculator
Enter your baby's age and the time they woke up, and see today's wake windows — the first one shortest, the last one longest — with every nap time worked out.
Wake windows by week (1–52)
| Week | Wake window | Naps / day | Total sleep |
|---|---|---|---|
| 1 | 30–45 minutes | 5–8 | 16–18 hrs |
| 2 | 30–45 minutes | 5–8 | 16–18 hrs |
| 3 | 40 minutes to 1 hour | 5–7 | 16–18 hrs |
| 4 | 40 minutes to 1 hour | 5–7 | 16–18 hrs |
| 5 | 45 minutes to 1.2 hours | 5–6 | 15–17 hrs |
| 6 | 45 minutes to 1.2 hours | 5–6 | 15–17 hrs |
| 7 | 1 hour to 1.5 hours | 5–6 | 15–17 hrs |
| 8 | 1 hour to 1.5 hours | 5–6 | 15–17 hrs |
| 9 | 1 hour to 1.5 hours | 4–6 | 14–16 hrs |
| 10 | 1 hour to 1.5 hours | 4–5 | 14–16 hrs |
| 11 | 1.2 hours to 1.8 hours | 4–5 | 14–16 hrs |
| 12 | 1.2 hours to 1.8 hours | 4–5 | 14–16 hrs |
| 13 | 1.2 hours to 2 hours | 4–5 | 14–16 hrs |
| 14 | 1.2 hours to 2 hours | 4–4 | 14–15.5 hrs |
| 15 | 1.2 hours to 2 hours | 3–4 | 14–15.5 hrs |
| 16 | 1.2 hours to 2 hours | 3–4 | 14–15 hrs |
| 17 | 1.5 hours to 2.5 hours | 3–4 | 14–15 hrs |
| 18 | 1.5 hours to 2.5 hours | 3–4 | 14–15 hrs |
| 19 | 1.5 hours to 2.5 hours | 3–4 | 14–15 hrs |
| 20 | 1.5 hours to 2.5 hours | 3–4 | 14–15 hrs |
| 21 | 1.5 hours to 2.5 hours | 3–3 | 14–15 hrs |
| 22 | 2 hours to 3 hours | 3–3 | 14–15 hrs |
| 23 | 2 hours to 3 hours | 3–3 | 14–15 hrs |
| 24 | 2 hours to 3 hours | 3–3 | 14–15 hrs |
| 25 | 2 hours to 3 hours | 3–3 | 14–15 hrs |
| 26 | 2 hours to 3 hours | 2–3 | 14–15 hrs |
| 27 | 2.5 hours to 3.5 hours | 2–3 | 14–14 hrs |
| 28 | 2.5 hours to 3.5 hours | 2–3 | 14–14 hrs |
| 29 | 2.5 hours to 3.5 hours | 2–3 | 14–14 hrs |
| 30 | 2.5 hours to 3.5 hours | 2–3 | 14–14 hrs |
| 31 | 2.5 hours to 3.5 hours | 2–3 | 14–14 hrs |
| 32 | 2.5 hours to 3.5 hours | 2–3 | 14–14 hrs |
| 33 | 2.5 hours to 3.5 hours | 2–2 | 14–14 hrs |
| 34 | 2.5 hours to 3.5 hours | 2–2 | 14–14 hrs |
| 35 | 2.5 hours to 3.5 hours | 2–2 | 14–14 hrs |
| 36 | 3 hours to 4 hours | 2–2 | 14–14 hrs |
| 37 | 3 hours to 4 hours | 2–2 | 14–14 hrs |
| 38 | 3 hours to 4 hours | 2–2 | 14–14 hrs |
| 39 | 3 hours to 4 hours | 2–2 | 14–14 hrs |
| 40 | 3 hours to 4 hours | 2–2 | 13–14 hrs |
| 41 | 3 hours to 4 hours | 2–2 | 13–14 hrs |
| 42 | 3 hours to 4 hours | 2–2 | 13–14 hrs |
| 43 | 3 hours to 4 hours | 2–2 | 13–14 hrs |
| 44 | 3.5 hours to 5 hours | 2–2 | 13–14 hrs |
| 45 | 3.5 hours to 5 hours | 2–2 | 13–14 hrs |
| 46 | 3.5 hours to 5 hours | 2–2 | 13–14 hrs |
| 47 | 3.5 hours to 5 hours | 1–2 | 13–14 hrs |
| 48 | 3.5 hours to 5 hours | 1–2 | 13–14 hrs |
| 49 | 3.5 hours to 5 hours | 1–2 | 13–14 hrs |
| 50 | 3.5 hours to 5 hours | 1–2 | 13–14 hrs |
| 51 | 3.5 hours to 5 hours | 1–2 | 13–14 hrs |
| 52 | 3.5 hours to 5 hours | 1–2 | 13–14 hrs |
How this works
A wake window is the stretch of awake time a baby can comfortably handle between sleeps. Too short and they fight the nap; too long and overtiredness makes sleep harder. Within a day, windows lengthen: the first window after morning wake-up is the shortest, and the window before bedtime is the longest. This calculator spreads the day's windows evenly between your baby's age-based minimum and maximum, and estimates nap lengths from typical ranges for the age.
Method & sources
Total sleep durations follow the AASM consensus recommendations endorsed by the American Academy of Pediatrics (4–12 months: 12–16 hours including naps; the newborn weeks reflect National Sleep Foundation ranges of 14–17+ hours, with many newborns sleeping up to 18–19). Wake windows are not part of the AASM/AAP consensus — they are practice ranges used by pediatric sleep consultants, widened here so the range errs generous. Treat every number as a starting point for observation, not a rule.
- Paruthi S, et al. Recommended Amount of Sleep for Pediatric Populations (AASM consensus, endorsed by the AAP). J Clin Sleep Med. 2016.
- Hirshkowitz M, et al. National Sleep Foundation sleep duration recommendations. Sleep Health. 2015.
- CDC Developmental Milestones checklists (cdc.gov/act-early/milestones).
- Wake-window ranges reflect common pediatric sleep-consultant practice ranges and are educational estimates, not a medical standard.
Fitting the car seats, too?
Sleep math is only half the puzzle with two or three kids. Our car seat three-across fit checker adds up the widths of the seats you're considering and compares them with your vehicle's rear hip room — and the gear by week hub covers what to buy at every stage of the first year.
Educational information only — not medical advice. Every baby develops and sleeps on their own timeline. If you have any concern about your baby's sleep, feeding, or development, talk to your pediatrician.